基于可展开式太阳漫反射板的星上相对辐射定标  

Onboard relative radiation calibration based on deployable solar diffuser

作　　者：王灵丽 武红宇 白杨 孟祥强[1] 贺小军 黄帅 杨松[1] WANG Lingli;WU Hongyu;BAI Yang;MENG Xiangqiang;HE Xiaojun;HUANG Shuai;YANG Song(Changguang Satellite Technology CO.,LTD.Jilin Key Laboratory of Satellite Remote Sensing Application Technology,Changchun 130000,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130000,China)

机构地区：[1]长光卫星技术有限公司吉林省卫星遥感应用技术重点实验室,长春130000 [2]中国科学院长春光学精密机械与物理研究所,长春130000

出　　处：《遥感学报》2021年第10期2067-2075,共9页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家重点研发计划(编号:2019YFE012700);吉林省科技发展计划(编号:20180201108GX)。

摘　　要：相对辐射定标的目的是降低或消除由于探测元件之间响应差异引起的图像高频竖向条纹或条带噪声,是遥感数据定量化应用的前提与基础。针对可展开式太阳漫反射星上定标装置,本文提出利用漫反射板收拢过程一次成像的星上相对辐射定标方法。通过卫星机械结构驱动漫反射板收拢调整传感器入瞳处太阳入射能量,获取覆盖传感器全部灰度动态范围的星上定标图像,采用直方图匹配算法解算相对辐射定标系数。为了验证本文提出的方法,利用在轨运行的吉林一号光谱星多光谱仪进行星上相对辐射定标实验,测试定标系数对原始图像的校正效果并定量分析相对辐射定标精度,实验结果表明定标系数能够有效消除全色与多光谱谱段地物原始图像的竖向高频条纹与条带噪声,定量分析的结果表明本文提出的方法在传感器灰度响应的全动态范围均能达到较好的校正效果,谱段相对辐射定标精度优于2%,为卫星在轨运行期间进行定量化遥感应用提供可靠保障。Optical satellite is an important means to obtain remote sensing data by earth observation,and radiation calibration is an important guarantee for quantitative remote sensing.As the satellite sensor is subject to mechanical vibration and acceleration shock during transportation and launch,also taking into account of the aging of optoelectronic devices during long-term on-orbit operation,the radiation performance of the sensor is inevitably affected.As such,the on-orbit radiation calibration is needed to correct the sensor radiation performance.On-orbit calibration is a very important on-orbit calibration method that uses on-satellite calibration devices to measure the radiometric calibration data after the satellite launch.The on-satellite calibrators include calibration lamps,Solar Diffusers(SD)and lunar calibrators,etc.The relative radiometric calibration is used to reduce or eliminate the image high frequency vertical fringe and stripe noise,which are caused by the response difference between detection elements.This process is the premise and foundation of the quantitative application of remote sensing image.In the background of the national major project of global cartography,in order to explore the application potential of relative radiometric calibration for the deployable solar diffuse reflector similar to the Jilin-1 GP satellite,a relative radiometric calibration method based on the solar diffuser is proposed in this paper,which is in order to solve the shortcomings of conventional relative radiometric calibration methods.The method overcomes the dependence of relative radiometric calibration on the accumulation and the uniform consistency of features in the data by imaging through the closing process of the solar diffuse reflector.The solar diffuser is driven by the satellite mechanical structure to close up and adjusts the solar incident energy at the entrance pupil of sensor,by this way acquiring the onboard calibration image.The calibration image covers the whole gray dynamic range of the sensor.Then

关 键 词：可展开式太阳漫反射板 星上相对辐射定标 直方图匹配 多光谱仪 吉林一号 

分 类 号：P237[天文地球—摄影测量与遥感]